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CHARLES W. TROTTER. Imprvvement ih Steam Heaters.

Patented May 30,1871.

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CHARLES` w.\'rRorrER, on` ROCHESTER, NEW YORK, AssrcNoR To EIMsELE`,GlORGrE FRAUENBERGER, OF SAME'PLAGE.

`uw,Puoi/Elusive* IN srEAMl-HEVATERS.

Specification formingpart of Letters Patent No. 115,392, dated May, 30,1871.

To all whom it concern:

y Be it known that I, GHARLEs W.- TROTTER,

of Rochester, in `the` county of Monroe and State of New York,haveinvented certain new l and useful Improvements in Boilers forHeating Buildings, Green-Houses, and other purposes 5 and I do herebydeclare `that the following is a full, clear, and exact descriptionthereof, reference being had to the accompanying drawing which makespart of this speciiication,and in whiclny Figure 1 represents anelevation of a boiler embracingmyimprovements. Fig. 2 represents avertical section through the same. Fig. 3 represents a horizontalsection through the upper chamber of the boiler at the line y 'y of Fig.l. Fig. 4 represents a similar section "through the lower chamber of theboiler at the i line :r w of Fig. 1. x

My invention relates to an apparatus for heating-water forconservatories, dwellings,

and other buildings; and consists in constructin g the boiler with"double conical-shaped chambers at the top thereof, both of whichcoinmunicate directly with alower annular chamber immediatelysurrounding the iire-box,while the inner one of the said conical upperchambersl constitutes the crown thereof 5 also, in constructing aboilerhaving upper and lower waterchambers with an intervening ilue, anduniting the interior upper water-chamber with the lower chamber byaseries of vertical tubes in such manner as to form an encircling com`munication between the outer water-chamber and the interior of thedre-box, whereby I am enabled to bring the outer as well as the inner water-chamber in direct contact with the chamber of combustion,andthusobtain averylarge heating-surface, free from alldanger of choking orclogging up any portion of the interior `of the boiler.

In the accompanying drawing the boiler is u represented as consisting ofa lower annular `chamber, A,

immediately surrounding the grate B, and forming theiire-box C.Thischamber A is surmounted by two other chambers, D E, having direct"communication therewith. The outer chamber D is partly cylindrical andpartly conical, and the cylindrical portion is of a diameter greaterthan that of the annular chamber A, and communicates with the latter bya suitable number` of external pipes, F,

while the conical portion D of the said chamber D forms the top of theboiler, and communicates directly With the conducting-pipe G by verticalpipes H. The interior conical chamber E forms the crown of the nre-box,and is arranged in such manner as to leave a space, a, between its outersurface and the inner surface of the outer conical portion Dl of thechamber, and communicates Awith the lower annular chamber A-by a seriesof vertical tubes, I. These tubes, therefore, support the crown of thefire-box, and are arranged atl suchdistances apart around the latter asto leave uninterrupted spaces, b, between them for the passage of thesmoke and heat directly from the lire-box Cinto the ilue a, between theouter and inner chambers D `D E, thus exposing the entire inner `surfaceof the outer chamber D D', as well as the entire surface of the innerchamber E, to the direct action of the heat, while the intervening fluea communicates directly with the exit-openin g c, for the smoke andgases, at the top of the boiler. The inner conical chamber E, being thusconnected with the annular chamber A, is also in communication with theconducting-pipe G by means of vertical pipe J, locatedat the apexthereof, and passing into and through the exit-opening c of the iiue ain the top of the outer conical chamber D. It will be seen, therefore,that the horizontal conducting-pipe Gr is located and arranged directlyover the exit-opening c, for

.K are connected to the lower annular chamber V A just above the grate,and, as this chamber communicates with the now-pipe Gr, the necy essarycirculation for water heating is free and uninterrupted, not onlythrough the chamber which forms the crown of the lire-box, but alsothrough the outer annular and conical chambers D D.

The boiler, with its upper and lower chan 2 llig bers, may be cast i'nsections and secured together in any convenient man ner, and support edby abcd-plate, which forms the ash-pit L; and the upper outer chamber isprovided with a door, M, through which the chamber of combustion issupplied with fuel, an opening, N, being left between the interiorvertical tubes I for that purpose, as shown in Fig. 3.

No brick-work whatever is used in the construction of this boiler, andit can, therefore, be readily moved from place to place and used withany kind of fuel.

Having described my invention, I claim?- 1. The interior verticalwater-chamber divided near the middle of its length so as to form alower and an upper section, A and E, and leave an annular interveningspace, b, for the passage of the heat and smoke from saidinterior chamber, as herein shown and described.

2. In a water-heating apparatus in which the interior water-chamber iscomposed of an upper and a lower section, supporting the v former uponthe latter by means of a series of Vertical water-tubes, I, arranged ina circular form in the division-space b, as herein shown and described.

3. The arrangement of the outer vertical water-tubes F for uniting thelower section A of the interior water-chamber with the upper outerwater-chamber D, in connection with the inner series of verticalwater-tubes I, arranged in a circular form for uniting the said lowersection A with the upper inner section E, as herein shown and described.

4. In combination With a water-heating apparatus in which the interiorchamber is composed of 'a lower and an upper section, A E, the interiorvertical water-tubes I, the intervening space b, the outer verticalWater-tubes F, the outer Water-chamber D, the intervening flue a, theconducting-pipe G, and its connectin g-tubes H and J, the several partsbeing constructed and arranged as herein shown and described.

CEAS. W. TROTTER.

Witnesses:

Guo. FRAUENBERGER, GEO. ENHORN.

